Question

find out no. of atom in 52 amu of Helium

Answer 1

Answer:-

(i) 1 mol of Ar = 6.022×1023atoms

∴ 52 mol of Ar = 52×6.022×1023atoms = 3.131×1025atoms

(ii) 1 atom of He = 4 u of He

4 u of He = 1 Atom of He

∴ 52 u of He = 1/4 × 52 = 13 atoms

(iii) 1 mol of He = 4 g = 6.022×1023atoms

∴ 52 g of He = (6.022×1023/4) × 52 atoms = 7.8286×1024atoms

Answer 2

Atomic mass od 1 helium atom = 4 amu.

given mass = 52 amu.

No of atoms × maas of 1 helium atom = given mass

no. of atoms × 4 = 52
no. of atoms = 13


Therefore, 13 atoms of He are gonna be in 52 amu of mass.